1221245053 has 8 divisors (see below), whose sum is σ = 1456391808. Its totient is φ = 1001269104.

The previous prime is 1221245041. The next prime is 1221245057. The reversal of 1221245053 is 3505421221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221245053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221245057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3792526 + ... + 3792847.

It is an arithmetic number, because the mean of its divisors is an integer number (182048976).

Almost surely, 2^1221245053 is an apocalyptic number.

It is an amenable number.

1221245053 is a deficient number, since it is larger than the sum of its proper divisors (235146755).

1221245053 is an equidigital number, since it uses as much as digits as its factorization.

1221245053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7585403.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1221245053 is about 34946.3167300933. The cubic root of 1221245053 is about 1068.8930973175.

Adding to 1221245053 its reverse (3505421221), we get a palindrome (4726666274).

The spelling of 1221245053 in words is "one billion, two hundred twenty-one million, two hundred forty-five thousand, fifty-three".